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Патент USA US2129728

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_3ept.13,19_38.
ç, BERG
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'2,129,728
TRAILER HITCH
Filed April 1, ' 1938l
@may A
Patented Sept. 13, 1938 I
`
2,129,728
UNITED sTATEs PATENT OFFICE
2,129,728
cui
TRAILER BITCH
Arriba,
Colo., assigner of one-half to
nerr.
ltßyA C. Liber, Denver, Colo.
Application April I, 1‘938, Serial No. 199,418
(Cl. 18S-142)
Figure 5 is a diagram showing the operation of
This invention relates, to improvements- in
the brake control means. '
.
trailer hitches of the type employed for connect
6Claims.
ing a trailer to a tractor.
g
In the drawing reference numeral 6 designates
«
the surface of the highway and 1 an automobile ‘
It is very common to employ an automobile or
5 a truck as a tractor for pulling a trailer along the
-tractor which may be a heavy duty tractor or an
ordinary pleasure car. and iigure 8 represents
highways, and for this purpose it is necessary
to provide a convenient means for hitching the
trailer to the tractor.
a trailer.
In the drawing Íthe trailer has been shown as ,
having four wheels, a pair of front wheels 8 and
a pair of rear wheels I0. The rear wheels are 10
provided with conventional brakes which have
not been shown in detail as they involve nothing
new.’ ‘I'he tractor is provid'ed with a hitch bar
Il that is secured to it in any suitable manner
and which is provided with a plurality of holes i2. 15
-
In order to make it possible for the tractor to
'10 control the assembly in going down steep hills
and in stopping, it is necessary to provide the
trailers with brakes and where large units are
employed, as for example, the big truck and trac
' tor units employed for transporting freight, the
ll trailer is frequently supplied with an air brake
which is controlled by the driver of the tractor.
Reference'numeral i3 represents the front axle
It is now quite common to employ anv ordinary
pleasure car for transporting a trailer, either of
nected by means of two -U-bolts i5.
of the trailer and to this a hinge plate I4 is _con
A bolt i6
extends through the hinge plate and through the
the kind employed for living quarters or for
20 transporting small loads of freight. Such `trail
ends of the tongue bars i1. These bars may be
duplicates and are spaced farther apart at the
rear lend than at the front end. The sections
indicated by reference numerals i8 are straight
and are' held in parallel relation by means of
ers are, as a rule, not -employed with any brakes
but depend entirely onthe brake of the auto
mobile, with the result that the assembly some
times gets out oi control in traveling down steep
25 hills and in making sudden stops.
It is the _object of this invention to produce a
spacers
I9.
A
tractor
bar ' comprising
two
straight side members 20 is bent into an elongated
U-shaped form such as that shown in Fig. 2.
trailer hitch of a simple andsubstantial con
struction that can be used in connection with The two sides are connected by a curved base
either two wheeled or tour wheeled trailers and member 2l which represents the base of the elon
s0 which will automatically apply a separate brake gated U. The sides 20 are held in spaced rela 30
to the trailer whenever the tension in the’ hitch tion by a spacer block 22 that is secured to the
is converted-:into a compressive'strain as in stop- , bars by means -of rivets 2_3. The spacer block 22
is provided with _a transverse‘openi'ng for` theping or going down hill.
Another object of this invention is to produce "' reception of the bolt 24. Attached to the upper
safe' trailer hitch in which means is provided for bar is an anchor plate 26 that is provided at its 35
_ automatically. setting the brake in case the con
nection between the trailer and the tractor is
' outer end with hole 26. The two tractor bars 20
are provided near their frontl ends with open
broken for any reason.
'I'he above and other objects that may become
4o apparent as this description proceeds are at
tainedby means o! a construction and an `ar
rangement of parts that will now- be described in
detailandiorthispurposer'eierencewillbehadv
to the accompanying drawing in which the inv
'45 vention has been villustrated in its present pre
ierred form and in which :A '
ings for the reception of a coupling pin 21 by
means oi which. the hitch is connected with the
hitch member Il. Two levers 28 are pivoted to
the iront spacer 'I9 in the manner shown quite
clearly in Figs. 2 and 3. The upper ends of theA
levers 28 -are inwardly inclined as indicated by 'y
reference numerals 29 and' are perforated for the
reception of a pin 30 that serves to connect the
coupling 3| with the upper ends of the levers.
Figure i is a view showing an assembly com
The tension member I2, which may be a“ rod or
prising a tractor and a 'trailer Aconnected by
means o! the’improvedhitch which forms the>
a steel cable. extends from the coupling member
50 subject of this invention;
Figure 2 is a section taken on line 2-2 Fig. 3,
showing the construction of the trailer hitch;
3l to the brakes on the rear wheels.- The. lower
end of each lever 28 is connected by‘means of a 50
link 33 to the pivot pin 2l. The parts are so
adjusted that when the hitch member is under
Figure 3 is a top plan view of the trailer hitch; . tension and the base 2l is in engagement with
Figure 4 is a detaileievation looking in the
65 direction of arrow l in Fig. 2; and
'
the'rearmost spacer il the levers 28`wlll be up
_ wardly and rearwardly inclined in the manner 56
2-
_
9,129,728
shown m 1113.2. In ease the trauer hitch 1s put
under compression instead offunder tension, as it
is when going down hill or in stopping, the tractor
the tongue spacers, the rear ends of the traction
bars being connected, said connection in combi
nation> with the tongue spacer forming a stop,
bars move rearwardly _becauséthere is nothing to ` spacer means positioned between the traction
prevent them from moving in this direction ex
bars, to the iront of the tongue spacers, means 5
cept the block 22. This rearward movement oi for attaching the front ends ofthe tractor bars
the tractor bars relative tc the tongue >tends to to a tractor, the tongue
the tractor member
rotate the levers 2l in a clockwise direction, having a limited amount-‘oi lost motion, permit
thereby putting >the brake rod l2 under tension ting relative longitudinal movement, and means
10 and applying the brake tothe rear wheels. If ' for applying the brakes to the trailer when the
10
the brake is applied too hard the compressive tractor member is subjected to compressive
strains will be changed to tension strains and strains.
the brake will be slightly released'so that the
2. A trailer hitch for use with a tractor, and
degree to which the brake is applied is automati
a trailer having supporting wheels provided with
15
cally controlled. In Fig. 5 thef. normal position
of levers 2l has been shown by dot and dash lines,
while the brake applying position has been indi
cated by solid ‘linea
-
l Wheneverit is desired to back the assembly,
20 it is necessary to prevent the tractor bars from
moving rearwardly a suiiicient distance to apply
thebrakesandiorthispurposeapinßlisin-`
serted in openings directly in front'oi' therear
spacer l! and thiapin limits the rearward move
ment of the tractor bars, thereby preventing the «
application o! the brake during backing. `Some
Btatesrequirethatthe trailerbe attachedto the
brakes, comprising in combination, la tongue 15
formed from two spaced bars having their rear
ends connected with the trailer, spacer means
i‘or holding the front ends of the bars in spaced
parallel relation, a tractor member comprising
a iiat bar bent. into an elongated U-shape, one 20
part being positioned above and the other below
the tongue spacers, a spacer between the sides of
the tractor member, adjacent its front end, a
lever pivotally connected, near its center, with
the` tongue, a link having one end connected withv
‘the lowerl end of the lever and the other end
pivotally- connected with the tractor member
whereby relative longitudinal movement between
tractor by _means of a chain in addition to the
-regular tractor hitch and in the drawing a chain the tongue and the tractor member will produce
ß has been shown with one end connected to a rocking movement oi'- the lever,- and a tension 30v
the anchor plate 2l and the other end connected ” member connecting theiupper ,end oi' the lever
by means of_ a clevis II with the hitch member with the trailer brakes, whereby when the trac
Il. This chain passes over a pulley l1 pivoted ' tion member is put under compression the brakes
on the front spacer Il. It will be seen that if , will be applied to the trailer wheels.
the tractor bars are disconnected from the hitch
3. A trailer hitch for use with a tractor, and a '35
member H and Vtension is applied to the end of
the chain connected with the hitch bar, this ten
sion will move the tractor bars rearwardly, there
by applying the brake.. Ii .the pin 21. for ex
trailer having supporting wheels provided with
brakes, comprising in combination, av tong-ue
formed from two bars having their rear ends con
nected with the trailen.f eans for holding the
ample, should accidentally become misplaced, it iront >ends of the bars i spaced parallel rela 40
is n
to stop’the trailer'as quickly as poesie tion, a tractor member, omprising two parallel
ble and with the means here illustrated the brake bars, one positioned above and the other below
‘will be applied under such circumstances. In >the tongue spacers, the rear ends of the traction
order to prevent the brake from releasing when bars being connected, said connection in combi-v
the chain breaks, a hook Il is pivoted to the ` nation with the `tongue spacer forming a stop, 45
spacer l! and is providedwith two .outwardly Vta
spacer means positioned between the traction
peringilngersllthatstraddlethechain.V When bars, to the iront of the tongue spacers,` means
the brake is being appliedthe chain will slip for attaching the front ends of the tractor bars
rearwardly between the angers _Il but will be to a tractor, the tongue and the 'tractor member
heid from movement in the opposite direction and having a limited amount oi lost motion, permit
therefore the brakes willnot release when the ting relative longitudinal movement, means i'or
chain break.
‘
applying the brakes to the trailer when' the trac
Prom the above description it willbe apparent. tor member is subjected to compressive strains,
that the tractor hitch described and shown on and means -ior applying the brakes to the trailer
the drawing is of a simple and substantial con
when _the connection between the tractor and the
struction which can be manufactured and sold ,
at _a moderate cost and which will automatically
apply the brakes to the tractor whenever this
becomes
. The means for' applying'the
brakes in- case the hitch becomes disconnected
tractor member breaks.
4. -A trailer'hitch for use with a tractor, and a
trailer'having supporting wheels provided with
brakes, comprisingI in combination, a tongue
formed from two bars having their rear ends 60
from the tractoraud i'or holding the brakes in connected with the trailer, means for holding the
applied position‘is a safety feature of great im
iront ends of the bars in `spaced parallel rela-.
partance which can be incorporated with the _ tion, a tractor member, comprising two parallelv
tractor hitch without unduly complicating the bars, one positioned above and the other below
construction or increasing _the cost.
- ’
the tongue spacers,` the rear ends oi’ the traction
Having described the invention what is claimed ' bars being connected, said- connection in combi
as new is: '
nation with the tongue spacer forming a stop,
- l. A trailerhiteh'i'or use with'a tractor, and spacer means positioned between the‘traction
a trailer having supporting wheels provided with bars, to the iront of the tongue spacers, means
brakes, `comprising in combination, a tongue for attaching the front ends of the Atractor bars 70
formed from two bars having their rear ends to a tractor,~ the tongue and the tractor member
?conneetedwith the
for holding having a limited amount oi’ lost motion, permit
theirontendsotthebarsinspacedmrallei rela ting relativel longitudinal> movement, means for.
tion, Va. tractor member, comprising two parallel Y applying the brakes to the trailer when the trac
bars, one positioned above and the other below _tor member is subjected to compressive strains.
l
.
2,129,728
means for applying the brakes to the trailer when
. the connection between the tractor and the trac
3
nection with the tractor whereby the brakes will
be'applied _to the trailer.> whenever the tractor
exerts a> greater pull on the tensionmember than
on the tractor member, and means for latching
thebrakes in one position when applied by the
second mentioned brake applying means.
5. A trailer hitchv for use with a tractor, and a action oi’ the tension member.
6.v A trail'er‘hitch for use with a tractor, and a 1`
trailer having supporting wheels provided with '
tor member breaks,'and-_means for latching the
brakes in operative position when applied by the
brakes, comprising in combination, a ’tongue
formed from two bars having their rear ends con
nected with the trailer, means for holding the
iront ends of the'v bars in spacedparallel relation,
a tractor member, comprising two parallel bars,
one vpositioned above and the other below the
tongue spacers, the rea'r ends of the traction bars
l5 being connected, saidconnection in combination
trailer having supporting wheels provided with
brakes, comprising in combination, a ' tongue
formed from- two spaced bars having their rear ,.
ends connected with the trailer, spacer means
for holding the front ends of the bars in spaced
parallel relation, a tractor member comprising
a flat bar bent into an elongated U-shape,- one
part being positioned above and the other below 15
withV the' tongue spacer forming a stop, spacer the tongue spacers, a spacer between the sides of
the tractor member, adjacent, its front end, a
means positioned between the traction bars, „to 4lever
en each side of 'the tongue, pivoted near
the front of the tongue spacers, meansfor at
its center to a pivot carried by the tongue, links
taching the front ends o! the tractor bars to a pivoted at their lower ends to the lower ends of 20
tractor,- the tongue and the tractor member hav
levers and at their upper ends to the tractor
lng a limited amount of lost motion', permitting the
member, at a point forward of the lever pivot
>relative longitudinal movement, means >for ap
whereby the upper ends of the levers will move
plying the brakes'to the trailer when the tractor forwardly when the tractor member moves rear
member _is subjected tov compressive strains, a wardly relative to the tongue, and a tension 25
25 pulley pivotally connected with the'tongue, a member connected with the upper ends of the
ñexible tension member passing _around the pul levers and operatively connected with the brakes
ley, one end oi the tension member being con
the trailer brakes will be applied when
nected with the tractor member at a p'oint for-y whereby
the
tractor
member'is subjected to compression.
ward of the tongue, the other end o! thevten-a
CARL BERG. 30
3o sion member having means for effecting a con-'-
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